I personally don't find either to be too troublesome to be honest. Annoying sure, but not aggravating.
Shotguns don't bother me too much because if one kills me it's because I let them get too close.
Normally I'll backpedal away from a shotgun user, and since I'm usually wearing Wings of Sacred Dawn I can also add vertical distance on top of horizontal distance and just pelt them with my pulse rifle. Generally leaving them helpless unless they switch to another weapon. If I do end up at close range with a shotgun user, my own slug shotguns can usually bean a pellet shotgun from just outside its kill range.
If anything snipers are more annoying for me because of the way flinch works. I could be unloading repeated pulse rifle bursts into a sniper, and they'll still land a perfect head shot regardless.
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Not possible on most control maps.